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Heckler & Koch
Heckler & Koch 51000384 5.56 NATO 16.5 In Piston
UPC642230270213
Manufacturer Part #51000384
HCD SKUHK51000384
Caliber223 REM | 5.56 NATO
In Stock
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$1,99300
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Piston
Action type
Matte Black
Finish
16.5 in
Barrel Length
Description
- HK MR556 Upper Receiver Kit 5.56mm - Model 51000384 - UPC: 642230270213 The HK MR556 Upper Receiver Kit is designed to retrofit Mil-Spec 5.56mm AR-style rifles with HK's advanced piston and pusher rod system.
- This innovative system replaces the traditional gas tube, significantly reducing malfunctions by preventing hot carbon fouling and waste gases from entering the receiver.
- This technology is a key feature of the HK416, trusted by elite military and law enforcement units.
- The kit includes a complete upper receiver/barrel assembly and is shipped in an HK Soft case.
- Specs:
Specifications
ManufacturerHeckler & Koch
Product TypeAccessory
Caliber223 REM | 5.56 NATO
ActionPiston
Barrel Length16.5 in
FinishMatte Black
Weight11.3 lb
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